<template>
  <el-select
      ref="mySelect"
      v-bind="$attrs"
      v-model="optionValue"
      :multiple="false"
      :disabled="disabled" style="width:100%">
    <el-option :value="optionValue" :label="optionValue" class="options">
      <el-tree id="tree-option" ref="selectTree" label="menuName" :data="options"
               @node-click="handleNodeClick"/>
    </el-option>
  </el-select>
</template>

<script>
import {defineComponent, ref, watch, onMounted} from "vue";

export default defineComponent({
  name: "mySelect",
  props: {
    modelValue: {type: String, default: ""},
    disabled: {
      type: Boolean,
      default: false,
    },
    options: {
      type: Array,
      default: () => [
        {
          label: "选项1",
          value: "1",
          children: [{label: "选项1-1", value: "1-1"}],
        },
        {label: "选项2", value: "2"},
      ],
    },
  },
  emits: ["nodeClick", "update:modelValue"],
  setup(props, context) {
    function getLable(arr, value) {
      let res = "";

      function find(arr, value) {
        for (let i = 0; i < arr.length; i++) {
          if (arr[i].value === value) {
            res = arr[i].label;
          }
          if (arr[i].children && arr[i].children.length) {
            find(arr[i].children, value);
          }
        }
      }

      find(arr, value);
      return res;
    }

    watch(
        () => {
          return props.modelValue;
        },
        () => {
          optionValue.value = getLable(props.options, props.modelValue);
        }
    );
    onMounted(() => {
      optionValue.value = getLable(props.options, props.modelValue);
    });
    const mySelect = ref();

    const optionValue = ref("");

    function handleNodeClick(node) {
      optionValue.value = node.label;
      mySelect.value.blur();
      context.emit("nodeClick", node);
      context.emit("update:modelValue", node.value);
    }

    return {
      mySelect,
      handleNodeClick,
      optionValue,
    };
  },
});
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
  height: auto;
  max-height: 274px;
  padding: 0;
  overflow: hidden;
  overflow-y: auto;
}

.el-select-dropdown__item.selected {
  font-weight: normal;
}

ul li >>> .el-tree .el-tree-node__content {
  height: auto;
  padding: 0 20px;
}

.el-tree-node__label {
  font-weight: normal;
}

.el-tree >>> .is-current .el-tree-node__label {
  color: #409eff;
  font-weight: 700;
}

.el-tree >>> .is-current .el-tree-node__children .el-tree-node__label {
  color: #606266;
  font-weight: normal;
}

.selectInput {
  padding: 0 5px;
  box-sizing: border-box;
}
</style>
